21608240

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8713}}^1$

素因数の和:8757

約数の個数: 40

約数和(自身を含む): 51865728

約数和(自身を除く): 30257488

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8713, 17426, 34852, 43565, 69704, 87130, 139408, 174260, 270103, 348520, 540206, 697040, 1080412, 1350515, 2160824, 2701030, 4321648, 5402060, 10804120, 21608240]

約数ペア:

[(1, 21608240), (2, 10804120), (4, 5402060), (5, 4321648), (8, 2701030), (10, 2160824), (16, 1350515), (20, 1080412), (31, 697040), (40, 540206), (62, 348520), (80, 270103), (124, 174260), (155, 139408), (248, 87130), (310, 69704), (496, 43565), (620, 34852), (1240, 17426), (2480, 8713)]